自己总结

1.where("")里面必须是“ ”，单引号不行，

不行：

$jdList = $PageModel->field("id,title,excerpt")->where("id = $jdclass['page_id']")->find();

不行：

$jdList = $PageModel->field("id,title,excerpt")->where('id = $jdclass["page_id"]')->find();

不行：

$jdList = $PageModel->field("id,title,excerpt")->where("id = $jdclass.page_id")->find();

只能用下面：

$jdList = $PageModel->field("id,title,excerpt")->where("id = $jdclass[page_id]")->find();

$jdclass = $NewsclassModel->field("page_id")->where("id=167")->find();$jdList = $PageModel->field("id,title,excerpt")->where("id = $jdclass[page_id]")->find();$this->assign("jdlist",$jdList);